Design, Fabrication, and Testing of Composite Energy-Absorbing Keel Beams for General Aviation Type Aircraft PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720460602
Category :
Languages : en
Pages : 28
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Book Description
A lightweight energy-absorbing keel-beam concept was developed and retrofitted in a general aviation type aircraft to improve crashworthiness performance. The energy-absorbing beam consisted of a foam-filled cellular structure with glass fiber and hybrid glass/kevlar cell walls. Design, analysis, fabrication and testing of the keel beams prior to installation and subsequent full-scale crash testing of the aircraft are described. Factors such as material and fabrication constraints, damage tolerance, crush stress/strain response, seat-rail loading, and post crush integrity, which influenced the course of the design process are also presented. A theory similar to the one often used for ductile metal box structures was employed with appropriate modifications to estimate the sustained crush loads for the beams. This, analytical tool, coupled with dynamic finite element simulation using MSC.Dytran were the prime design and analysis tools. The validity of the theory as a reliable design tool was examined against test data from static crush tests of beam sections while the overall performance of the energy-absorbing subfloor was assessed through dynamic testing of 24 in long subfloor assemblies.Kellas, Sotiris and Knight, Norman F., Jr.Langley Research CenterGENERAL AVIATION AIRCRAFT; COMPOSITE STRUCTURES; KEELS; FOAMS; GLASS FIBERS; KEVLAR (TRADEMARK); CRASHWORTHINESS; FULL SCALE TESTS; STRESS-STRAIN RELATIONSHIPS; FINITE ELEMENT METHOD
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720460602
Category :
Languages : en
Pages : 28
Get Book Here
Book Description
A lightweight energy-absorbing keel-beam concept was developed and retrofitted in a general aviation type aircraft to improve crashworthiness performance. The energy-absorbing beam consisted of a foam-filled cellular structure with glass fiber and hybrid glass/kevlar cell walls. Design, analysis, fabrication and testing of the keel beams prior to installation and subsequent full-scale crash testing of the aircraft are described. Factors such as material and fabrication constraints, damage tolerance, crush stress/strain response, seat-rail loading, and post crush integrity, which influenced the course of the design process are also presented. A theory similar to the one often used for ductile metal box structures was employed with appropriate modifications to estimate the sustained crush loads for the beams. This, analytical tool, coupled with dynamic finite element simulation using MSC.Dytran were the prime design and analysis tools. The validity of the theory as a reliable design tool was examined against test data from static crush tests of beam sections while the overall performance of the energy-absorbing subfloor was assessed through dynamic testing of 24 in long subfloor assemblies.Kellas, Sotiris and Knight, Norman F., Jr.Langley Research CenterGENERAL AVIATION AIRCRAFT; COMPOSITE STRUCTURES; KEELS; FOAMS; GLASS FIBERS; KEVLAR (TRADEMARK); CRASHWORTHINESS; FULL SCALE TESTS; STRESS-STRAIN RELATIONSHIPS; FINITE ELEMENT METHOD
Author: Sotiris Kellas
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 28
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Book Description
Author: Sotiris Kellas
Publisher:
ISBN:
Category : Space vehicles
Languages : en
Pages : 52
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Book Description
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 806
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Book Description
Author: Marcus Dwight Billings
Publisher:
ISBN:
Category : Impact
Languages : en
Pages : 90
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Book Description
Author: Kevin A. McAfee
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 14
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 720
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Book Description
Author: F. Elaldi
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
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Book Description
Author: Committee on New Materials for Advanced Civil Aircraft
Publisher: National Academies Press
ISBN: 0309588782
Category : Technology & Engineering
Languages : en
Pages : 99
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Book Description
The major objective of this book was to identify issues related to the introduction of new materials and the effects that advanced materials will have on the durability and technical risk of future civil aircraft throughout their service life. The committee investigated the new materials and structural concepts that are likely to be incorporated into next generation commercial aircraft and the factors influencing application decisions. Based on these predictions, the committee attempted to identify the design, characterization, monitoring, and maintenance issues that are critical for the introduction of advanced materials and structural concepts into future aircraft.
Author: Edward M. Lenoe
Publisher: Springer Science & Business Media
ISBN: 1468410334
Category : Technology & Engineering
Languages : en
Pages : 858
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Book Description
The Fourth Conference on Fibrous Composites in Structural Design was a successor to the First-to-Third Conferences on Fibrous Composites in Flight Vehicle Design sponsored by the Air Force (First and Second Conferences, September 1973 and May 1974) and by NASA (Third Conference, November 1975) which were aimed at focusing national attention on flight vehicle applications of a new class of fiber reinforced materials, the advanced com posites, which afforded weight savings and other advantages which had not been previously available. The Fourth Conference, held at San Diego, California, 14-17 November 1978, was the fi rst of these conferences to be jointly sponsored by the Army, Navy and Ai r Force together with NASA, as well as being the first to give attention to non-aerospace applications of fiber reinforced composites. While the design technology for aerospace applications has reached a state of relative maturity, other areas of application such as mi litary bridging, flywheel energy storage systems, ship and surface vessel components and ground vehicle components are in an early stage of development, and it was an important objective to pinpoint where careful attention to structural design was needed in such applications to achfeve maximum structural performance payoff together with a high level of reliability and attractive economics.
